High chambered coke oven structure



J. VAN ACKEREN HIGH CHAMBERED COKE OVEN STRUCTURE Feb. 14, 1967 2 Sheets-Sheet 1 Filed Aug. 31, 1964 INVENTOR. JOSEPH VA N 40x4 ELM Lf l I I F I/I VI SECTI N A-A 2 Sheets-Sheet 2 INVENTOR. Jars/"J! VAN HEKL-PLA/ BY 5 J ma JE'A/L-Y 1967 J. VAN ACKEREN HIGH CHAMBERED COKE OVEN STRUCTURE Filed Aug. 31, 1964 United States Patent C "ice HIGH CHAMBERED COKE OVEN STRUCTURE Joseph van Ackeren, Pittsburgh, Pa., assignor to Koppers Company, Inc., a corporation of Delaware Filed Aug. 31, 1964, Ser. No. 393,125 9 Claims. (Cl. 202135) This invention relates to improvements in a high chambered horizontal regenerative coke oven and more particularly to a high chambered coke oven having high and low burners and an improved means for mixing waste combustion gas with a rich fuel gas supplied to the high burners.

In the design and construction of horizontal retort coke ovens, one of the primary objectives in recent years has been to increase oven capacity without adversely affecting the quality of the coke produced therein. To attain this objective, the height of the coking chamber has been increased and high and low burners are utilized in the flues to supply heat to the adjacent chambers. For a coke product of high quality, it is desirable that the heat supplied by the high and low burners be distributed uniformly through the heating walls to the coal in the coking chambers.

It is also desirable in high chambered coke ovens to obtain long flame combustion so that radiant heat is supplied to a greater part of the flues in which combustion progresses, thus assuring a uniform temperature from the bottom to the top of the flues and to the coal heated in the adjacent elongated coking chambers. When rich fuel gas is used as the heating gas, it has been found desirable to dilute the rich fuel gas with an inert diluent gas such as the products of combustion within the combustion flue.

One problem that is encountered in the use of a rich fuel gas is the thermal decomposition of the fuel gas in the conduits or riser passageways connecting the source of fuel gas with the high burners. It has been found that the rich fuel gas conveyed to the high burners is subjected to elevated temperatures between the base of the flue and the high burner gas port. The elevated temperature causes thermal decomposition of the rich fuel gas in the riser passages and deposits a carbon residuum on the riser passage walls. This carbonaceous residiuum causes a serious operating problem in that the riser passages become clogged and cannot be burned out with air. It has been discovered by admixing a portion of the waste combustion gases with the rich fuel gas that the admixture may be subjected to an elevated temperature without substantial thermal decomposition of the rich fuel gas and without substantial deposition of carbonaceous residuum on the walls of the riser passages.

There have been several proposed systems for admixing waste combustion gas with the rich fuel gas before the rich fuel gas is conveyed through the riser passages to the high level gas ports. In all of the proposed systems, however, there is a substantial differential in pressure between the location where the waste combustion gas is withdrawn from the combustion system and the location of the gas ports for the high level burner. One of the desirable features of the invention herein described is the low differential in pressure in the recirculating system for the high burner. The Waste combustion gas that is admixed with the rich fuel gas is withdrawn from the flame flue adjacent to the high burner gas ports so that the differential pressure between the high burner gas port and the point where the waste combustion gas is withdrawn from the combustion flue is very low. The invention herein described also provides an improved means for conveying the waste com- 3,304,246 Patented Feb. 14, 1967 bustion gases to the location where the waste combustion gases are admixed with the rich fuel gas.

The invention is described in conjunction with a high chambered horizontal coke oven battery of the wellknown Becker crossover type disclosed in United States Patent No. 2,100,762. It should be understood, however, that the present improvements are not necessarily restricted to coke ovens of the type described, and the benefits of the present improvements can be realized in coke ovens of other types.

Briefly, the invention includes alternate partition walls that have high burner gas ports extending into both of the adjacent flues. Thus a common partition wall provides outlet gas ports for the high burners in the flues on opposite sides thereof. Parallel conduits or passages extend downwardly through the common partition wall from the respective high burner gas ports to the base or supporting mat of the oven battery where the passages are suitably connected to a rich fuel gas distributor header through a venturi throat section. The same common partition wall that has the pair of high burner gas ports has a waste conduit or passageway with a pair of oppositely extending lateral openings adjacent to its upper portion. The waste gas passageway extends downwardly through the partition wall between the pair of passageways that convey the fuel gas upwardly to the high burner gas ports. The waste gas passageway communicates with the other pair of passageways adjacent the oven base or pad. A portion of the waste combustion gas is Withdrawn from the flue through the lateral openings and flows downwardly through the waste gas conduit to the location where the waste gas conduit communicates with the venturi throat sections of the vertical gas supply passages. The waste combustion gas is admixed with the rich fuel gas in the venturi throats and the diluted fuel gas is conveyed through the pair of vertical supply passages to the high burner gas ports.

With this arrangement, during the combustion cycle the vertical riser ducts or passages for the high burners are filled with the mixture of rich fuel gas and waste combustion gas and the adjacent waste gas conduit or passageway is filled with inert waste combustion gas. This condition provides a desirable recirculating effect due to the difference in density of the two columns of gases and provides a high flow rate of recirculating gas. Both the high burners and the low burners may be burned simultaneously or the high Iburners and the low burners may burn in an alternating pattern where the high burner will be supplied with diluted fuel gas for a predetermined portion of the burning cycle and then the supply of diluted fuel gas to the high burner is turned off and the low burner is supplied with fuel gas for the remaining portion of the burning cycle. With either simultaneous burning or alternate burning, the rich fuel gas fed through the nozzles to the venturi throat portion of the riser passages for the high burners aspirates a quantity of waste combustion gas through the waste combustion gas conduit and the waste gas is admixed with the rich fuel gas to hereby form a diluted admixture which is thereafter supplied to the high burner gas ports. The diluted admixture burns in a desirable elongated flame at the high burner gas ports also minimizes the possibility of carbon deposition within the riser passages to the high burner gas ports.

Accordingly, the principal feature of this invention is to provide an improved high chambered coke oven structure that includes high and low burners and means for admixing a portion of the waste combustion gas formed within the combustion flue with the rich fuel gas that is supplied to the high burners.

Another feature of this invention is to provide a high chambered oven structure that includes a means for maintaining a low-differential pressure in the recirculating system between the waste combustion gas intake and the high burner gas ports.

Another feature of this invention is to provide a high chambered coke oven structure wherein the waste combustion gas utilized as a diluent for the fuel gas is withdrawn from the combustion flue at a location adjacent the high burner gas port.

- In the drawings:

FIGURE 1 is a crosswise vertical section through a coke oven battery embodying features of the present invention, the battery comprises coke ovens of the so called underjet type, the section AA of FIGURE 1 being taken longitudinally through a heating wall and along the line AA of FIGURE 2: the section B-B is taken through a coking chamber and aregenerator and along the line B-B of FIGURE 2.

. FIGURE 2 is a vertical sectional elevation taken along line 2v2 longitudinally of a coke oven battery, shown in FIGURE 1.

FIGURE 3 is a horizontal section taken along the line 3-3 of FIGURE 1 illustrating the high burner gas ports and the vertical passageways through the partition wall.

FIGURE 4 is a view in section taken along the line 44 in FIGURE 1 illustrating the arrangement of the vertical passageways in the pillar wall beneath the partition wall.

FIGURE 5 is a view in section taken along the line 55 in FIGURE 1 and illustrating the connection between the waste gas passageway and the vertical fuel supply passageways adjacent the oven battery base.

Referring to the drawings and particularly FIGURES 1 and 2 there is illustrated a coke oven battery generally designated by the numeral that includes a plurality of heating walls 12 and a plurality of intermediate elongated vertical coking chambers 14. The heating walls 12 form the side walls of the respective coking chambers 14 and are supported by heavy supporting pillar walls 16 that extend crosswise of the battery and lengthwise of the coking chambers beneath the respective heating walls. The pillar walls 16 support the heating walls 12 and divide the regenerative space beneath the heating walls and coking chambers into pairs of regenerators 40 and 42 that extend across the battery parallel with the heating walls 12. A regenerator division wall 18 is positioned lbetween the regenerators 40 and 42 and provides support for the coal charge in the coking chamber 14 directly above the regenerator division wall 18. The regenerators 40 and 42 are provided with sole flues 20 that are connected to the respective regenerators by a vertical duct 22 that distributes the gases from the sole flues into the respective regenerator chambers.

The heating walls 12 comprise a plurality of vertically disposed heating lines 24 that have intermediate partition walls 26 and a common partition wall 28 therebetween.

The common partition walls 2-8 are higher than the intermediate partition walls 26 and are flared adjacent their upper portion as is illustrated in FIGURE 1 to provide a single passageway 30 for a pair of heating flues lying on opposite sides of the intermediate partition wall 26 located between two common partition walls 28. The intermediate partition walls 26 have a curved upper portion 32 that does not impede the flow of the combustion gases from the flues 24 through the passageway 30. The combustion gases flow through the passageway 30 from the pair offlues 24 into a horizontal flue 36 and from the horizontal flue 36 through a crossover conduit 3-8 into a corresponding group of dues in the heating wall on the opposite side of the respective coking chambers, as is illustrated in FIGURE 2.

The vertical heating lines 24 communicate with the pair of regenerators 40 and 42 that are positioned on opposite sides of the pillar wall 16 by means of ducts 44 and 46. Heated air is conveyed from the regenerators 40 and 42-upwardly through the ducts 44 and 46 into the respective vertical heating fines 24. Beneath the regenerators 40 and 42 the coke oven battery 10 has a mat or base 48 that is positioned above ground level and is used to provide horizontal passageways for the supply of fuel gas to the respective vertical flues 24.

The flues 24 have a pair of gas ports or burners at different elevations therein at which locations the fuel gas is ignited and burned within the combustion flues during the burning cycle. The gas port 52 is commonly designated the low level burner and the gas port 54 is commonly designated as the high level burner. The low level burner or gas port 52 is located adjacent the base or floor 56 of the heating lines. The high level burner 54 is spaced upwardly of the low level burner 52 and supplies heat to the upper portion of the heating flue 24. Thus each of the heating flues 24 has a low level burner 52 and a high level burner 54 to supply heat through the heating walls 12 to the coal charge in the coking chambers 14. The low level burners 52 are connected to a vertical conduit or passageway 58 formed in the pillar wall 16 that extends downwardly through the oven base battery 48. The conduits 58 each have a venturi throat section adjacent their lower portion and anadjustable nozzle 62 which regulates the rate of flow of the gas through the conduit 58 to the low burner 52. The conduit 58 extending through the mat 48 is suitably connected to horizontal headers or supply conduits 60 that are suitably valved to supply fuel gas to all of the low burners 52 in a bank of heating flues 24 on one side of each coking chamber 14. Similar conduits are provided for the low level burners 52 in the heating lines 24 011 the other side of the respective coking chamber 14. A portion of the conduit 60 is illustrated in FIGURE 1. The high level burners 54 are arranged in the common partition wall 28 and extend into the adjacent fines 24 on opposite sides thereof. The common partition wall 28 has a pair .of lateral protuberances 64 and 66 which extend into the heating flues 24 on 0pposite sides thereof as illustrated in FIGURE 3. The protuberance 64 has a lateral passageway 68 that communicates with the gas port of the high level burner 54v and with a vertical passageway 70 that extends downwardly through the common partition wall 28, through the base .or floor 56 of the flue and through the pillar wall 16 to the oven battery base. Similarly the protuberance 66 has a lateral passageway 72 that connects the gas port for the high level burner 54 in the flue 24 on the opposite side of partition wall 28 with a vertical passageway 74 that is parallel to and spaced laterally from vertical passageway 70. The passageway 74 extends downwardly through the partition wall 28 and the pillar wall 16 to the base 48 of the coke oven battery. The pair of vertical passageways or conduits 70 and 74 are illustrated in FIGURES 2 and 3.

Beneath the mat 48 there are a pair of horizontal supply conduits 76 for each bank of heating flues 24. The respective conduits 76 are connected to the conduits 70 and 72 land the vertical conduits 70 and 72 each have a venturi throat section 78 with an adjustable nozzle 80 positioned therein. Thus the rich fuel gas is supplied to the high burner 54 in a heating flue 24 from the supply conduits 76 through the vertical conduit or passageway 70. The high burner 54 in the adjacent flue 24 is likewise supplied with rich fuel gas from the other horizontal supply conduit 76 through the vertical conduits 74.

The conduits or passageways 70 and 74 extend through the masonry in the common partition wall 28 and through the masonry in the pillar wall 16 therebeneath. As is illustrated in FIGURE 2 the passageways 70 and 74 converge slightly adjacent the regenerators 40 land 42 because of the lateral dimension of the pillar wall 16. The relative position .of the passageways 70 and 74 in the pillar wall 16 is illustrated in FIGURE 4.

The common partition wall 28, adjacent the upper flared portion has a pair of lateral passageways 82 that communicates with the flues 24 on opposite sides of the common partition wall 28. The lateral passageway 82 merges into a common vertical passageway 84, that is formed in the common partition wall 28, and is illustrated in FIGURE 3. The vertical passageway 84 is positioned between the vertioal passageways 70 and 74 and extends downwardly through the masonry of the common partition wall 28 to the base or floor 56 of the flues 24. The passageway 84 has a laterally diverging section 86 and a vertical portion 88 that is spaced laterally from the passageways 7 and 74. The vertical portion 88 extends downwardly through the pillar wall 16 and communicates with the vertical passageways 70 and 74 by horizontally extending branch conduits 90 and 92 (FIGURE With this arrangement, the lateral passageways 82, adjacent the flared portion of the common partition wall 28, are connected with the vertical passageways 70 and 74 adjacent the venturi portions 78 by means of the conduit 84. The passageway 84 is utilized to convey waste combustion gas downwardly therethrough from the upper portion of the flue 24 to the venturi throat section 78 of the rich fuel gas supply passageways 70 and 74.

With the above described circulatory system for the rich fuel gas and the waste combustion gas it is now possible to admix a portion of the waste combustion gas with the rich fuel gas adjacent the venturi throat section 78 of the vertical riser ducts or passageways 70 and 74 and sup ply the admixture to the high level burners 54 for combustion at that location. During the combustion cycle fuel gas is fed through the horizontal conduits 60 and 76 to the respective low and high burners 52 and 54 in a bank of combustion flues 24. The fuel gas is fed through the vertical riser 58 from the horizontal conduit 60 to the gas port of the low level burner 52 where it is admixed with combustion air supplied from the regenerators 40 and 42 and burned adjacent the fiue base or floor 56. Fuel gas, preferably rich fuel gas, is supplied through horizontal conduits 76 and vertical riser passageways or conduits 70 and 74 to the high level burners 54 in adjacent pairs of flues 24. The hot combustion gas formed in flue 24 passes upwardly through the flues and the passageway 30 to the horizontal flue 36. The hot combustion gas then flows through the crossover conduit 38 and then downwardly through the connected flues on the opposite side of the coking chamber 14.

A portion of the waste combustion gas is aspirated through the lateral passageways 82 in the common partition wall 28 adjacent the flared portion of the common pillar wall 28. The waste combustion gas aspirated through the passageways 82 flows downwardly through the passageway or conduits 84 to the juncture where the conduit is connected to the fuel supply conduits 70 land 74 by the branch conduits 90 and 92. At the venturi throat portion 78 of both conduits 70 and 74, the waste combustion gas is admixed with the rich fuel gas flowing upwardly through conduits 70 and 74 to dilute the rich fuel gas and provide an elongated flame at the high level burners 54.

It should be noted that the lateral passageways 82 are positioned above the high level burners 54 in the same common partition wall 28, and the products of combustion from the high level burners 54 are aspirated through the lateral opening 82 in the same common partition wall 28 and conducted downwardly through passageway 84. There is thus formed a recirculation system for the waste combustion gas from a location adjacent the upper portion of the flue 24 to the high level burner 54. The flow rate of the waste combustion gas between the high burner 54 and the lateral passageway 82 is relatively low, so that the rich fuel gas flowing upwardly in the vertical passageways 70 and '74 will efliciently withdraw an adequate supply of waste combustion gas from the flues 24 and admix the waste combustion gas with the rich fuel gas to effectively dilute the rich fuel gas and provide an elongated flame at the high burners 54 and minimize the thermal decomposition of the fuel gas in the vertical passageways 70 and 74 between the base of the flues and the high level burners 54.

During the combustion cycle, the vertical passageways 70 and 74 are filled with an admixture of rich fuel gas and waste combustion gas, while the adjacent vertical conduit or passageway 84 is filled with inert waste gas. There is a difference in density between the Waste combustion gas and the admixture of rich fuel gas and waste combustion gas that contributes gas downwardly through the passageway 84 to be admixed with the rich fuel gas at the base of the coke oven battery.

. With this arrangement both the high level burner ports 54 and the low level burner ports 52 can be burned simultaneously without the thermal decomposition of the fuel gas in the passageways. Through suitable control means, the high and low level burners 54 and 52 can burn with an alternate pattern while the flues 24 are receiving combustion air from the regenerators 40 and 42. The vertical conduits 78 and 72 can be suitably connected by a valve means to both a source of pressurized air and fuel gas so that when the conduits are supplied with a rich fuel gas, the high level burners 54 will aspirate a quantity of the waste combustion gas and will dilute the rich fuel as previously described. When the high level burners 54 are not being supplied with fuel gas through passageways 70 and 74 they can be supplied with pressurized air that will also aspirate a quantity of gas from the flues thus forming an admixture of air and waste combustion gas.

Since the combustion gas is at an elevated temperature the admixture of air and waste gas will consume any carbon formations that may be present either at the high level burners or at the riser conduits 70 and 74 leading thereto.

According to the provisions of the Patent Statutes, the principle, preferred construction, and mode of operation of the invention have been explained, and what is now considered to represent its best embodiment has been illustrated and described. However, it should be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically illustrated or described.

I claim:

1. In a high chambered horizontal coking retort oven a combination of heating elements therefor to provide uniform heating for the coking chambers comprising,

a plurality of heating walls on opposite sides of said coking chambers,

said heating walls having transversely extending partition walls forming a plurality of combustion flues,

said combustion flues having a base portion and high level and low level burners,

each pair of said flues having a common partition wall with laterally flared portions adjacent the upper end of said common partition wall,

said common partition wall having a first opening therein spaced upwardly from said flue base portion and forming a gas port for said high level burner,

a source of fuel gas located below said flue base portion,

a fuel gas supply passageway in said common partition wall connecting said source of fuel gas and said first opening, said passageways arranged to conduct fuel gas from said source to said high level gas port,

said common partition wall having a second opening therein spaced above said first opening and below said common partition wall laterally flared portions and forming an inlet opening for combustion gas, and

a combustion gas passageway in said common partition wall connecting said second opening with said fuel gas supply passageway adjacent said source of fuel gas, said combustion gas passageway arranged to conduct a portion of the gaseous products of combustion from said flue to said fuel gas supply passageway for intermixing with said fuel gas as an inert diluent gas.

2. In a high chambered horizontal coking retort oven a combination of heating elements therefor to provide uniform heating for the coking chambers comprising,

a plurality of heating walls on opposite sides of said coking chambers,

said heating walls having transversely extending partition walls forming a plurality of combustion flues,

said combustion flues having a base portion and high level and low level burners,

each pair of said flues having a common partition wall with laterally flared portions adjacent the upper end oflsaid common partition wall,

said common partition wall having a pair of openings therein on opposite sides thereof and forming gas ports for said high level burners in said combustion flues on opposite sides of said common partition wall, said pair of openings spaced above said flue base portion,

a source of fuel gas for each of said high level burners located below said flue base portion,

a pair of fuel gas supply passageways in said common partition wall connecting said respective gas ports in said common partition wall with said respective source of fuel gas, said fuel supply passageways arranged to conduct fuel gas from said source to said respective high level burner gas ports,

said pair of fuel gas supply passageways extending downwardly through said common partition wall in parallel spaced relation to each other,

said common partition wall having another opening therein spaced above said high level burner gas ports and below said common partition wall laterally flared portions and forming an inlet opening for combustion gas, and

a combustion gas passageway in said common partition wall connecting said last named opening with both of said fuel gas supply passageways adjacent said source of fuel gas, said combustion gas passageway extending downwardly through said common partition wall in parallel spaced relation to said pair of fuel gas supply passageways,

said combustion gas passageway arranged to conduct a portion of the gaseous products of combustion from said flue to both of said fuel gas supply passageways for intermixing with said fuel gas as an inert diluent gas.

3. In a high chambered horizontal coking retort oven a combination of heating elements to provide uniform heating for the coking chambers comprismg,

a plurality of heating walls on opposite sides of said coking chambers,

said heating walls having transversely extending partitionwalls forming a plurality of combustion fiues,

said combustion flues having a bare portion and high level and low level burners,

each pair of flnes having a common partition wall with laterally flared portions adjacent the upper end of said common partition wall,

said common partition wall having a pair of openings therein on opposite sides thereof and forming gas ports for said high level burners in said combustion flucs on opposite sides of said common partition wall, said pair of openings spaced above said flue base portion,

a source of pressurized fuel gas for each of said high level burners located below said flue base portion,

a pair of fuel gas supply passageways in said common partition wall connecting said respective gas ports in said common partition Wall with said respective source of fuel gas, said fuel supply passageways arranged to conduct fuel gas from said respective source to said respective high level burner gas ports,

said pair of fuel gas supply passageways extending downwardly through said common partition wall in parallel spaced relation to each other,

said common partition wall having a second pair of openings therein on opposite sides thereof and forming inlet openings for combustion gas, said second pair of openings spaced above said first pair of openings and below said common partition wall laterally flared portions, and

a combustion gas passageway in said common partition wall connecting said second pair of openings with both of said fuel gas supply passageways adjacent said source of pressurized fuel gas, said combustion gas passageway extending downwardly through said common partition wall in parallel spaced relation to and between said pair of gas supply passageways,

the flow of fuel gas upwardly through said fuel gas passageways arranged to aspirate a portion of the gaseous products of combustion from both of said flues at said second pair of openings in said common partition wall and said combustion gas passageway arranged to conduct said aspirated gas downwardly therethrough to said fuel gas passageways for admixing with said fuel gas as an inert diluent gas.

4. In a high chambered horizontal coking retort oven a combination of heating elements therefor to provide uniform heating for the coking chambers comprising,

a plurality of heating walls on opposite sides of said coking chambers,

a plurality of pillar walls extending below said heating walls with regenerator chambers between said pillar walls,

a base member supporting said pillar walls,

said heating walls having transversely extending partition walls forming a plurality of combustion flues,

said combustion flues each having a base portion with an opening therein forming a gas port for a low level burner,

each pair of said flues having a common partition wall with laterally flared portions adjacent the upper end of said common partition wall, said common partition wall having a first opening therein spaced upwardly from said flue base portion and forming a gas port for a high level burner,

a source of rich fuel gas located below said base member,

a fuel gas supply passageway in said common partition wall, said pillar wall therebelow and said base member connecting said source of rich fuel gas and said first opening in said common partition wall, said fuel gas supply passageway arranged to conduct fuel gas from said source to said high level gas port,

said common partition wall having a second opening therein spaced above said first opening and below said common partition wall laterally flared portions an: forming an inlet opening for combustion gas, an

a combustion gas passageway in said common partition wall and said pillar wall therebeneath connecting said second opening with said fuel gas supply passageway adjacent said base member, said combustion gas passageway arranged to conduct a portion of the gaseous products of combustion from said flue to said fuel gas supply passageway for intermixing with said fuel gas as, an inert diluent gas.

5. In a high chambered horizontal coking retort oven a combination of heating elements therefor to provide uniform heating for the coking chambers comprising,

a plurality of heating walls on opposite sides of said coking chambers,

a plurality of pillar walls extending below said heating walls with regenerator chambers between said pillar walls,

a base member supporting said pillar walls,

said heating walls having transversely extending partition walls forming a plurality of combustion flues,

said combustion flues each having a base portion with an opening therein forming a gas port for a low level burner,

each pair of said flues having a common partition wall with laterally flared portions adjacent the upper end of said common partition wall,

said common partition wall having a pair of openings therein on opposite sides thereof and forming gas ports for high level burners in said combustion flues on opposite sides of said common partition wall, said pair of openings spaced above said base member,

a source of fuel gas for each of said high level burners located below said flue base member,

a pair of fuel gas supply passageways in said common partition wall, said pillar wall there-below and said base member connecting said respective source of fuel gas with said respective gas ports in said common partition wall, said fuel gas supply passageways arranged to conduct fuel gas from said respective source to said high level burner gas ports,

said pair of fuel gas supply passageways extending downwardly through said common partition wall in parallel spaced relation to each other,

said pair of fuel gas supply passageways converging slightly toward each other beneath said flue base portion and extending downwardly through said pillar wall therebelow in parallel spaced relation to each other,

said common partition wall having another opening therein spaced above said high level burner gas ports and below said common partition wall laterally flared portions and forming an inlet opening for combustion gas, and

a combustion gas passageway in said common partition wall and said pillar wall therebeneath' connecting said last named opening with said fuel gas supply passageway adjacent to said base member, said combustion gas passageway arranged to conduct a portion of the gaseous products of combustion from said flue to said gas supply passageway for intermixing with said fuel gas as an inert diluent gas,

said combustion gas passageway extending downwardly through said common partition wall in parallel spaced relation to said pair of fuel gas supply passageways.

6. In a high chambered horizontal coking retort oven as set forth in claim in which;

forth in claim 5 which includes;

another source of fuel gas located below said base member,

a passageway connecting said last named source of fuel gas with said gas port for said low level burner,

said last named passageway extending through said pillar wall positioned beneath said flue.

8. In a high chambered horizontal coking retort oven the combination of heating elements therefor to provide uniform heating for the coking chambers comprising,

a plurality of heating walls on opposite sides of said coking chambers,

a plurality of pillar walls extending below said heating walls with regenerator chambers between said pillar walls,

a base member supporting said pillar walls,

said heating walls having transversely extending partition walls forming a plurality of combustion flues,

said combustion flues each having a base portion with an opening therein forming a gas port for a low level burner,

each pair of said flues having a common partition wall with laterally flared portions adjacent the upper end of said common partition wall,

said common partition wall having a pair of openings therein on opposite sides thereof forming gas ports for high level burners in said combustion flue on opposite sides of said common partition wall, said pair of openings spaced above said flue base portion,

a source of pressurized fuel gas for each of said high level burners located below said base burner,

a pair of fuel gas supply passageways in said common partition wall, said pillar wall therebelow, and said base member connecting said respective source of pressurized fuel gas with said respective gas ports in said common partition Wall, said fuel gas supply passageways arranged to conduct gas from said respective source to said respective high level burner gas ports,

said pair of fuel gas supply passageways extending downwardly through said common partition wall in spaced relation to each other,

said pair of fuel gas passageways converging slightly toward each other beneath said flue base portion and extending downwardly through said pillar wall in parallel spaced relation to each other,

said fuel gas supply passageways each having a venturi section adjacent said base member,

said common partition wall having a second pair of openings therein on opposite sides thereof and forming inlet openings for combustion gas, said second pair of openings spaced above said first pair of openings and below said common partition wall laterally flared portions, and

a combustion gas passageway in said common partition Wall connecting said second pair of openings with both of said fuel gas supply passageways at said venturi sections in said fuel gas supply passageways, said combustion gas passageway extending downwardly through said common partition wall in parallel spaced relation to and between said pair of fuel gas passageways,

said combustion gas passageway diverging laterally from said fuel gas passageways beneath said flue base portion and extending downwardly through said pillar wall in parallel spaced relation to said pair of fuel gas supply passageways,

the flow of fuel gas upwardly through said fuel gas passageway venturi sections arranged to aspirate a portion of the gaseous products of combustion from both of said flues at said second pair of openings in said common partition wall and said combustion gas passageway arranged to conduct said aspirated gas downwardly therethrough to said fuel gas passageways at said venturi sections for admixing with said fuel gas as an inert diluent gas.

9. In a high chambered horizontal coking retort oven a combination of heating elements therefor to provide uniform heating for the coking chambers comprising,

a plurality of heating walls on opposite sides of said coking chambers,

said heating walls having transversely extending partition walls forming a plurality of combustion flues,

said combustion flues having a base portion and high level and low level burners,

each pair of said flues having a common partition wall with laterally flared portions adjacent the upper end of said common partition wall,

said common partition wall having a first opening therein spaced upwardly from said flue base portion and forming a gas port for said high level burner,

a source of gas located below said flue base portion,

first conduit means connecting said source of fuel gas and said first opening, said first conduit means arranged to conduct fuel gas from said source to said high level gas port,

said common partition Wall having a second opening therein spaced above said first opening and below said common partition wall laterally flared portions and forming an inlet for combustion gas, and

second conduit means connecting said second opening with said first conduit means adjacent said source 10 of fuel gas, said second conduit means arranged to conduct a portion of the gaseous products of combustion from said flue to said first conduit means for intermixing with said fuel gas as an inert diluent gas.

References Cited by the Examiner UNITED STATES PATENTS 2,306,678 12/1942 Van Ackeren 202-151 X 3,222,260 12/1965 Becker 202135 X MORRIS O. WOLK, Primary Examiner.

JAMES H, TAYMAN, JR., Examiner. 

1. IN A HIGH CHAMBERED HORIZONTAL COKING RETORT OVEN A COMBINATION OF HEATING ELEMENTS THEREFOR TO PROVIDE UNIFORM HEATING FOR THE COKING CHAMBERS COMPRISING, A PLURALITY OF HEATING WALLS ON OPPOSITE SIDES OF SAID COKING CHAMBERS, SAID HEATING WALLS HAVING TRANSVERSELY EXTENDING PARTITION WALLS FORMING A PLURALITY OF COMBUSTION FLUES, SAID COMBUSTION FLUES HAVING A BASE PORTION AND HIGH LEVEL AND LOW LEVEL BURNERS, EACH PAIR OF SAID FLUES HAVING A COMMON PARTITION WALL WITH LATERALLY FLARED PORTIONS ADJACENT THE UPPER END OF SAID COMMON PARTITION WALL, SAID COMMON PARTITION WALL HAVING A FIRST OPENING THEREIN SPACED UPWARDLY FROM SAID FLUE BASE PORTION AND FORMING A GAS PORT FOR SAID HIGH LEVEL BURNER, A SOURCE OF FUEL GAS LOCATED BELOW SAID FLUE BASE PORTION, A FUEL GAS SUPPLY PASSAGEWAY IN SAID COMMON PARTITION WALL CONNECTING SAID SOURCE OF FUEL GAS AND SAID FIRST OPENING, SAID PASSAGEWAYS ARRANGED TO CONDUCT FUEL GAS FROM SAID SOURCE TO SAID HIGH LEVEL GAS PORT, SAID COMMON PARTITION WALL HAVING A SECOND OPENING THEREIN SPACED ABOVE SAID FIRST OPENING AND BLOW SAID COMMON PARTITION WALL LATERNALLY FLARED PORTIONS AND FORMING AN INLET OPENING FOR COMBUSTION GAS, AND A COMBUSTION GAS PASSAGEWAY IN SAID COMMON PARTITION WALL CONNECTING SAID SECOND OPENING WITH SAID FUEL GAS SUPPLY PASSAGEWAY ADJACENT SAID SOURCE OF FUEL GAS, SAID COMBUSTION GAS PASSAGEWAY ARRANGED TO CONDUCT A PORTION OF THE GASEOUS PRODUCTS OF COMBUSTION FROM SAID FLUE TO SAID FUEL GAS SUPPLY PASSAGEWAY FOR INTERMIXING WITH SAID FUEL GAS AS AN INERT DILUENT GAS. 